68 lines
1.5 KiB
C
68 lines
1.5 KiB
C
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/*
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* SPDX-License-Identifier: GPL-2.0-or-later
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* Host specific cpu indentification for AArch64.
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*/
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#include "qemu/osdep.h"
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#include "host/cpuinfo.h"
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#ifdef CONFIG_LINUX
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# ifdef CONFIG_GETAUXVAL
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# include <sys/auxv.h>
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# else
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# include <asm/hwcap.h>
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# include "elf.h"
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# endif
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#endif
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#ifdef CONFIG_DARWIN
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# include <sys/sysctl.h>
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#endif
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unsigned cpuinfo;
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#ifdef CONFIG_DARWIN
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static bool sysctl_for_bool(const char *name)
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{
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int val = 0;
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size_t len = sizeof(val);
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if (sysctlbyname(name, &val, &len, NULL, 0) == 0) {
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return val != 0;
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}
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/*
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* We might in the future ask for properties not present in older kernels,
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* but we're only asking about static properties, all of which should be
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* 'int'. So we shouln't see ENOMEM (val too small), or any of the other
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* more exotic errors.
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*/
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assert(errno == ENOENT);
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return false;
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}
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#endif
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/* Called both as constructor and (possibly) via other constructors. */
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unsigned __attribute__((constructor)) cpuinfo_init(void)
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{
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unsigned info = cpuinfo;
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if (info) {
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return info;
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}
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info = CPUINFO_ALWAYS;
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#ifdef CONFIG_LINUX
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unsigned long hwcap = qemu_getauxval(AT_HWCAP);
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info |= (hwcap & HWCAP_ATOMICS ? CPUINFO_LSE : 0);
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info |= (hwcap & HWCAP_USCAT ? CPUINFO_LSE2 : 0);
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#endif
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#ifdef CONFIG_DARWIN
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info |= sysctl_for_bool("hw.optional.arm.FEAT_LSE") * CPUINFO_LSE;
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info |= sysctl_for_bool("hw.optional.arm.FEAT_LSE2") * CPUINFO_LSE2;
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#endif
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cpuinfo = info;
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return info;
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}
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